PS D:\projects\cnb\liujiajia-me\learning\nodejs\cmdline> node .\parse-json.js --help
parse-json.js [命令]

命令：
  parse-json.js parse-json [options]  parse JSON file

选项：
      --version  显示版本号                                               [布尔]
  -f             JSON file to parse                                       [必需]
  -h, --help     显示帮助信息                                             [布尔]

PS D:\projects\cnb\liujiajia-me\learning\nodejs\cmdline> node .\parse-json.js -f input.json
{ f: 'input.json' }
{"name":"liujiajia","age":18,"gender":"male"}

PS D:\projects\cnb\liujiajia-me\learning\nodejs\cmdline> echo '{"name":"liujiajia","age":18,"gender":"male"}' | node .\parse-json.js -f -
{ f: '-' }
{"name":"liujiajia","age":18,"gender":"male"}

PS D:\projects\cnb\liujiajia-me\learning\nodejs\cmdline> cat .\input.json | node .\parse-json.js -f -
{ f: '-' }
{"name":"liujiajia","age":18,"gender":"male"}